Kendall,
I know several people who have had it. All recovered in a few months with no side effects or relapses. This one is easy. And the furnace can be replaced. Keep in mind that your voice doesn't have to be - replaced I mean. I can guarantee that you are more aware of it than anyone else. Look what Bogart did with that little slur. Make the most of it.
By the way, they do come in threes and you have officially had your share.
Mary